You
            can add as many audio and video tracks as you want. However, only
            one video track can have an active output channel. Up to 32 audio
            tracks can be mapped to input strips on the AudioDesk.
         
         To activate a track's output:
         
         
            - Click the respective track's output indicator.
               The inactive symbol (--)
                  changes as follows:
                
                  - If you activated a video output channel,
                     a “P” appears indicating it is the Primary video
                     track. The previously active video output channel is deactivated. 
                  
- If you activated an audio track's output
                     indicator, a number from 1 through 32 appears. You can assign an
                     audio track to any of the 32 input strips on the AudioDesk by clicking
                     the indicator and dragging left or right.